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This reverts commit f533db5c.

Reason for revert: Breaks sequential running of PRE_ tests. See, for example, ChromeTracingDelegateBrowserTestOnStartup.StartupTracingThrottle failures in https://ci.chromium.org/p/chromium/builders/ci/Linux%20ASan%20LSan%20Tests%20(1)/82236. Each PRE_* test must run to completion before the next one is started.

Original change's description:
> [Jobs]: Convert test launcher to using jobs.
>
> Test launcher relies on the fact that TaskScheduler won't have more
> concurrency than max_tasks to control |num_parallel_jobs|. The
> TaskScheduler is allowed to run more tasks concurrently than
> |max_tasks| when some of these tasks are blocked.
> This CL converts Test launcher to using Jobs and ensures that
> |runner_count_| concurrency is respected.
>
> Bug: 905788
> Change-Id: Ia090271e11b322140da1bf7e1526f4ba16bfb524
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414556
> Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
> Reviewed-by: François Doray <fdoray@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#812145}

TBR=fdoray@chromium.org,etiennep@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 905788
Change-Id: I82463e729c7be1bd7dc5d73ba90b1715f7d9bba8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445013Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813138}